While my wife is out in our TD, I can say that there is no way to mix up a right and left side on our TD.

The amber is on top and the slanted plastic edge goes towards the side of the car (wider at the bottom, narrow at the top) while the straight plastic edge goes towards the back.

Don

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1980 300TD-T (82 Turbo and Trans) 159,000 Miles "Jackie-O"
1983 300SD 272,000 Miles "Aristotle"
1987 Jeep Wagoneer Limited - keeps the MB's off the ice and out of the snow
1994 BMW 530it